Charged Dilatonic Black Holes: String frame vs Einstein frame

TL;DR

This paper compares charged dilatonic black holes in string and Einstein frames, analyzing physical measurements like gyromagnetic ratios and Hawking radiation to identify differences and experimental distinguishability.

Contribution

It provides a detailed comparison of black hole properties in string and Einstein frames, highlighting measurable differences and potential experimental tests.

Findings

Gyromagnetic ratios differ between frames.

Decay laws via Hawking radiation vary with frame.

Light propagation shows frame-dependent effects.

Abstract

The descriptions of Reissner-Nordstroem and Kerr-Newman dilatonic black holes in the Einstein frame are compared to those in the string frame. We describe various physical measurements in the two frames and show which experiments can distinguish between the two frames. In particular we discuss the gyromagnetic ratios of black holes, the decay law via Hawking radiation and the propagation of light on black hole backgrounds.